According to Piaget, what is the key aspect of the preoperational stage?

Question

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According to Piaget, the key aspect of the preoperational stage is the development of symbolic function, which refers to the ability to use symbols (such as words or images) to represent objects or concepts. This is evidenced in the stage by children's use of pretend play, language, and mental imagery. The other options listed (B, C, and D) are not key aspects of the preoperational stage, although they may be important developments that occur during this stage.

According to Piaget, What Is the Key Aspect of the Preoperational